FIELD: plasma technology and space engineering. SUBSTANCE: dielectric coat is applied to pole screen surface on anode side and to external surface of magnetic poles facing anode. Insulating coat may be also applied to side surface of anode-gas distributor on side of pole screens and magnetic poles. EFFECT: reduced erosion of poles and screens of accelerator magnetic system; reduced probability of anode-to-magnetic-system electric breakdown. 2 cl, 1 dwg
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